Crawl Space Insulation

For a home to be perfectly comfortable as far as the air conditions are concerned, there has to be proper insulation in the areas most prone to leaks. Crawl spaces have for the longest time been subject to batt and fiberglass insulation but modern research has brought to light some of the shortcomings of this insulation method. These crawlspaces are typically designed as some mini-basements. Ideal ones should be able to curb air infiltration in the home, so as to ultimately prevent the presence of allergens.

Traditional crawlspaces are typically damp, and the presence of pests is very likely. They are also prone to unintentional air leaks that render the entire area moist. The durability and air quality of the house can be improved by maintaining the dry nature of the crawl space.

When your crawl space is frequently subject to round vents penetrating into the house, you need to take action immediately. While fiberglass provide some form of insulation, they cannot prevent the entry of moisture and water vapor. Once applied, the liquid expands and forms bubbles that dry up, filling up space. Because gases are naturally poor conductors of heat, and because the foam is made up of materials that have high resistance to heat transfer, heat exchange through it is significantly reduced.


Regardless of how well you insulate your basement using batts and fiberglass, cold air will somehow find its way into the house. Warm contaminated air will also be prone to seep in through these insulations.

The fact is, if your home’s crawl space is not fully sealed, you could be looking at potentially contaminated air, poisonous gas entry and presence of dangerous organisms such as algae in your space. The only material that can fully create a barrier against the insulation between the floor joists in your crawl space is spray foam insulation. It provides the perfect thermal barrier from plumbing obstructions, as well as wide joist spacing.

Why Batts aren’t effective for your crawl space

Batts and fiberglass are decent insulating agents. However, during the summer, when temperatures are soaring, moist air is capable of flowing in and around the batts to create condensation that facilitates the growth of algae and decaying on your flooring system.

Effectiveness of spray foam on crawl spaces

Spray foam insulation particularly closed cell will provide an effective barrier against humid air between the home’s subfloor surface and the ground. Furthermore, it is able to prevent the upward movement of the moist air further into the attic, which could potentially lead to more trouble.

Low-energy structures and buildings located in very cold climate areas should be insulated using spray foam insulation below the ground cover. Once the slab is applied above ground, the temperature and humidity in the house become much more bearable. In addition, an air barrier is created that protects the rim joists from adversities in the summer and winter.

Since the insulation in the crawl spaces should be non-water sensitive, spray foam insulation is the ideal choice because of its water resistance qualities. The foam insulation layer is vapor impermeable, and is therefore very ideal in keeping the interior walls dry and home conditions perfect, especially because rim joists are always cold regardless of the season. Other disadvantages of insulation that may be visible in other insulation types are overcome by spray foam, and your crawl space is guaranteed to be dry and in a healthy state.

While some of these may appear insignificant to the common observer, their impact on your energy cost over the long term is immense. Our technicians will take a look at your home and identify all areas that require sealing before commencing work. It is advisable to remove any items stored in attics and other heavy work areas in advance so as to make the insulation job quicker and more efficient.

To receive a free quotation for your home’s spray foam insulation, call us on 1-647-973-3626.